Jeong Jae-seong

Lee Bong-seok

vice-principal (Yu-seong Tech)

Baek Cheol-gyu

Han Kyung-rok

Kim

Seon-ho's father

Yuk Si-gyeong

Pyo Dong-ho

Park Yoongab

Marshal Kim

Kim Byeong-chan

No Hak-Su

Kim Min-sub

Deok Chul's father

Kong Ji-cheol

Chief neurosurgeon

Kim In-Joo

Kang Mong-koo

Kwon Suk

Bae Sang-bok

[Oh Sol’s boss]

Representative Goo

Lee Woo-taek

Yoon Sang-tae

Jo Se-hyeon

Pharm

Container Oya